Appendix A. Lss Characteristics And Line Weights; Characteristics Of The Lsss; Line Weight Calculation; Lic 1 Through Lic 4 Characteristics - IBM 3745 Connection And Integration Manual

Appendix A. LSS Characteristics and Line Weights

This appendix provides the rules for calculating weights of the lines attached to the
low-speed scanners (LSS).

Characteristics of the LSSs

Table A-1 gives some characteristics of the LICs 1 to 4. For LICs 5 and 6, refer to
the LIC5/6 Migration and Integration Guide, SA33-0416 or an earlier version of the
Connection and Integration Guide, SA33-0129.
Table A-1. LIC 1 Through LIC 4 Characteristics
Line Speed
Number of Ports
Protocols
ITU-T Interface

Line Weight Calculation

The line weight is the percentage of the low-speed scanner capacity that the line
uses. For example, five lines each with a weight of 20 take up 100% of the
capacity of a low-speed scanner. Spare (unused) lines have a weight of zero.
The line weight is given by the following formula: Weight = Line Speed / C.
"C" is a coefficient related to the line protocol.
The values of the coefficient "C" are given in Table A-2 for LIC types 1, 3, 4A and
4B. For LIC types 5 and 6, refer to the LIC5/6 Migration and Integration Guide,
SA33-0416.
 Copyright IBM Corp. 1988, 2003
LIC 1 LIC 3
Up to 19 200 bps Up to 256 kbps
4
Asynchronous Synchronous
(start-stop) (SDLC, BSC)
Synchronous
(SDLC, BSC)
V.24, V.25, V.35
V.25 bis, X.20 bis,
X.21 bis
Table A-2. Line Weight Calculation for LIC types 1, 3, 4A and 4B
Line Protocol
SDLC Duplex
SDLC Half-Duplex
BSC EBCDIC under NCP
BSC under EP
BSC ASCII under NCP
Start-stop
LIC 4A
Up to 9600 bps
1
Synchronous
(SDLC)
X.21
LIC types 1 and 4A LIC types 1 and 4A
(Up to 4 LICs per (More than 4 LICs
LSS) per LSS)
1920 1536
3456 3072
3456 3072
3456 3072
2420 2016
43 x no of bits/char 43 x no of bits/char
LIC 4B
9600 bps to
256 kbps
4 1
Synchronous
(SDLC)
X.21, X.24
LIC types
3 and 4B
2560
4052
4052
4052
3041
A-1